Terbium Tb
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Terbium is a chemical element with symbol Tb and atomic number 65. It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime and euxenite.
65
Atomic Number
158.93 u
Atomic Mass
1630.15 K
Melting Point
3503 K
Boiling Point
8.23 g/cm³
Density
2.5 Å
Atomic Radius
1.94 Å
Covalent Radius
1.2
Electronegativity
5.86 eV
First Ionization Energy
112.4
Electron Affinity
6
Number of Shells
2, 8, 18, 27, 8, 2
Electron Shell Occupations
0.18 J/g
Specific Heat